Portable electric-motor block with speed-reducing device



Jan. 28, 1930. L. A. WISLER 1,744,998

PORTABLE ELECTRIC MOTOR BLOCK WITH SPEED REDUCING DEVICE File J y 192 2 Sheets-Sheet 1 Fig! y 24 g3 g2 1; :1 m I 19 1 z; 16 25 g! I mun QR? ll- M k Jan 28, 1930. L. A. wl'sLER I 1,744,998

PORTABLE ELECTRIO MOTOR BLOCK WITH SPEED REDUCING DEVICE Fi y 192 2 Sheets-Sheet 2 .ZA. Wils'fei;

Patented Jan. 28, 193i? UNITE STATES PATENT ()FFICE LOUIS ADOLPHE WISLER, OE PARIS, FRANCE PORTABLE ELECTRIC-MOTOR BLOCK VIITH SPEED-REDUCING DEVICE Application filed July 8, 1927, Serial No. 204 375, and in France July 1?, 1926.

This invention relates to improvements in bottom 8 of the casing 2 in arcuated openportable electric motor blocks such as those ings concentric with the armature shaft, so used for driving various machines in farms, that these fingers can, from the exterior of and having an electric motor the speed of the casing 2, be actuated for causing the powhich is yaried by angularly adjusting the sition of the brushes to vary and, consequent- 55 brush-support. ly, for modifying the working speed of the Th invention has for object to facilitate motor. The displacements of the fingers 17 the control of such portable electric motor are obtained by means of a regulatorknob blocks and, to this end, concerns a special 18 constituting also a switch for placing the switch which permits, by having two essenmotor in or out of circuit. This regulator- 60 tial displacements, of adjusting the brushknob 18 is constituted by a block of insulating support and of closing or opening the feedmaterial, such as ebonite for instance it can ing circuit of the motor. also be made of metal by insulating the cir- On the accompanying drawing, is shown, cular copper contact 24;. It fits, by a central fay way of example only, an electric motor bore 19, on an axis secured on the base improved according to the invention. member 16. A spring 1 is interposed be- Flgure 1 1s a vertical axial section of the tween an annular bearing portion 22 of the improved motor. knob 18 and the base member 16 so as to Figs. 2 and 3 are an elevation and a front move the casing 2, in the absence of any ex- ZOyiew respectively, of a rotating brush-supternal cause, away from the said knob 18. 7

port used in connection with the special The free end of the fingers 17 enter a notch switch mentioned above. or perforation 23 of the knob, so as to be The motor of the block may be advanangularly rigid with the latter. A ring or tageously an electric single-phase-repulsion crown 241 made of a metal which is preferably 25 motor. This motor comprises a frame 1 supa good conductor, and such as copper for I porting the inductors and on the two side instance, is inserted in a groove provided faces of which fit two casings 2 and 3 which in the inner face of the knob. When are secured by screws 4, as illustrated, or by the latter is pushed home towards the casany other suitable means. ing 2 and held in that position, the

30 The shaft 5 of the armature is supported crown 24: is in contact with two wipers 25 at its ends by ball bearings 6 respectively guided in sockets 26 made of insulating mamounted in a web 7 of the casing 3 and on terial (fiber or the like) and secured on the the bottom 8 of the casing 2. The latter enbottom of the casing 2 in any suitable mancloses: partly the armature 9, its commutator ner. These wipers 25, subjected to the action 3 l0 and the brushes 11 which can be of any of springs 26, pass through perforations of suitable arrangement and, for instance, 0011- the casing for fitting against the conducting stituted by carbon sticks guided in the end crown 2 1 and are connected by their stems bearing portions of a brush-carrier 12 shown 27, one to the current feeding wire, the other in detail in Figs. l and 5. This brushcarrier to the exciting winding. The two insulated is provided with a central ring mounted on wires of the line: that leading to a wiper and a bearing portion 13 of the casing 2, so that the return wire coming from the exciting itcan be subjected to angular displacements winding, are connected under insulating concentric with the commutator 10. The sheath 28 entering the casing 2 through a brush-carrier is laterally held by a base memsuitable opening. In Fig. 1, the various con- 45 her let secured on the casing by suitable nections are not visible, except for one of the means and, for instance, by screws 15 which wipers, but it will be easily understood that, secure on the same casing an outer base memif the knob 18 is in the postion shown in Fig. ber 16. Two fingers 17 secured on the brush- 1, the winding of the inductor is in the circarrier, parallel to the axis of the angular cuit of the source of current supply. When 59 displacements of the latter, pass through the the knob 18 is sufiiciently removed from the .100'

casing 2, the wipers 25, held by the nuts 29 acting as abutments, cease to be in contact with the conducting ring 2i, the exciting winding is put out of circuit and the operition ot' the motor is interrupted.

By modifying the position of the brushes 11, the working speed of the motor is regulated and the direction of rotation of the armature can also be reversed. lhe position at the brushes is modified by angularly displacing the knob 18 which drives with it the brush-carrier l2, throughthe medium of the fingers 17. v

For immobilizing the regulator-knob 18 in running position, or in the stopping position of the motor, use can be made of the following device:

The axis 20 is provided with a peripheral groove 30 and a short circumferential notch 31 connected by an aperture 32 formed according to a generating line. A finger, constituted for instance, by the end of a screw 33 screwed in a radial screw threaded hole of the knob 18, can'move in the groove 30 and fnthe aperture lVhen the fly-wheel 18 is pushed in towards the casing, the finger 33 enters the groove 30 after having moved in the aperture 32. By angularly moving the knob 18, thefinger 33 enters the groove 30 and lmmobilizes the knob which holds the spring 21- under compression. The angular displacements of the knob for the purpose of modifying the position of the brushes, can be effected without the knob abandoning the longitudinal position it occupies in Fig. 1 and which corresponds to the-operation of the motor. When the finger 33 is brought opposite the aperture 32, it the knob 18 is released, the spring .21 pushes it back to the end of the aperture 32. A slight angular displacement of the knob causes the finger 30 to enterthe short circumferential notch 31 of the axis 20 and the said knob 18 is locked in translation in the stopping position of the motor.

' For the purpose of facilitating all the above mentioned operations, the knob 18 can be provided with ahandle 34 having a milled periphery, and its outer face can bear any useful indications combined with reference harks traced on the casing 2 in order to indicate the operator the positions of throwing in circuit, of opening of the circuit, of reversal of the direction of running and of acceleration or slowing down of the motor,

etc.

TV h-at I claim as my invention and desire to secure by Letters Patent is:

'1. In an electric motor in which the speed is varied by angularly adjusting the brushs pport, a knob axially drilled, a journal on the motor casing for the said knob, and arranged line with the motor shaft, a circular contact-piece on the knob,'concentric with this latter, wipers on the motor casing opposite the said circular contact-piece, fingers support, a

on the brush-support passing through arouated apertures or the motor casing and entering recesses of the knob, a compression spring interposed between the latter and a fixed part of the motor casing, and means to lock the said knob in a longitudinal position for maintaining contact between the wipers and the circular contactpiece.

2. in an electric motor in which the speed is varied by angularly adjusting the brushknob axially drilled, a journal on the motor casing for the said knob and arranged in line with the motor shaft, a circular contact-piece on the knob concentric with this latter, wipers on the motor casing opposite the said circular contact-piece, fingers on the brush-support passing through arouated apertures of the motor casing and entering recesses of the knob, a compression spring interposed between the latter and a fixed part of the motor casing, a radial finger provided on the knob and entering grooves of the journal in order to permit of longitudinally immobilizing the said knob on the said journal, by allowing the former to tree ly rotate.

In testimony whereof I have signed my name to this specification.

V LOUIS ADOLPHE VVISLER. 

